My sister is about to take a trip to Costa Rica in a few weeks. She will be flying on an airline. She wants to travel light (hiking pack) and will be there for a month and a half. She is in a Spanish speaking program that teaches the language while you are in the country. Obviously she doesn't want to take alot of cameras and GPS stuff because there is a risk of it being stolen. If anyone has suggestions on what basic equipment she should take it would help alot.

PS- she will need rain gear for it is the rainy season there!